JP2007174594A - Electronic apparatus, television receiver and television tuner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of ensuring high radio communication quality in location-free use and performing more stable communication as needed. <P>SOLUTION: The TV tuner 300 comprises a connection section for freely attachable and detachable wired connection with a display device 200, a wireless communication section 306 for performing wireless communications with the display device 200 and a trunk device 50, and a network section 305 for controlling the wireless communication section 306. Furthermore, when canceling the wired connection between the TV tuner 300 and the display device 200, the network section 305 discriminates whether to use a wireless communication channel between the wireless communication section 306 and the trunk device 50 as a wireless communication channel between the wireless communication section 306 and the display device 200 and when it is discriminated not to use the wireless communication channel, the wireless communication channel of the wireless communication section 306 is changed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic device including a wireless device, a television receiver, and a television tuner.

  In recent years, for example, for the purpose of signal transmission between electronic devices such as a server storing a moving image data, a television receiver (hereinafter referred to as a TV apparatus), and a personal computer, the electronic devices are connected by wire / wireless. It has been broken. By connecting each electronic device, for example, the moving image data stored in the server can be viewed on the television receiver.

  Such connection between electronic devices is often performed by wireless communication. This is because when wireless communication is used, it is not necessary to consider the wiring for connecting each device, and it becomes possible to use location-free.

  On the other hand, in wireless communication, it is difficult to stably secure communication at a high transmission rate due to the influence of radio wave interference and the like. Therefore, a technique for ensuring the stability of wireless communication has been studied (for example, see Patent Document 1).

In Patent Document 1, it is considered that a wireless channel in which no interference wave exists is detected, and communication is performed at a transmission rate at which the received electric field strength is equal to or higher than a threshold value under the detected wireless channel.
JP 2003-319448 A

  However, even if the method described in Patent Document 1 is adopted, it is difficult to secure stable communication in wireless communication. Thereby, for example, when video data exchange between the TV apparatus main body and the television tuner (hereinafter referred to as TV tuner) is always performed wirelessly, due to the influence of radio wave interference with other wireless communication devices, The quality of the transmitted video information may be reduced. In such a case, a wired connection is better than a wireless connection between the TV apparatus body and the TV tuner.

  The present invention has been made in view of the above circumstances, and provides an electronic device capable of ensuring high wireless transmission quality when using location-free and capable of more stable communication as necessary. Objective.

  In order to solve the above problems, the present invention provides a base device that is connected to a network and wirelessly communicates with a backbone device that functions as an access point, and is detachably wired to the base device and wirelessly communicable with the base device. When the base device is wirelessly communicated with the backbone device when wired with the terminal device and is not wired with the terminal device Provides an electronic device comprising: a communication unit that wirelessly communicates with the terminal device; and a channel changing unit that changes a wireless communication channel of the communication unit when a wired connection between the base device and the terminal device is released. .

  According to the present invention, it is possible to provide an electronic device capable of ensuring high wireless transmission quality when using location-free and capable of more stable communication as required.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
1 and 2 are schematic views showing the concept of the electronic apparatus according to the first embodiment of the present invention.

  In the present embodiment, a description will be given assuming that a separable television receiver 100 (hereinafter referred to as a separable TV) is assumed as an electronic device.

  The separate TV 100 includes a display device 200 (terminal device) and a TV tuner 300 (base device) that are detachably connected via a connection cord or integrally with a connector, and the TV tuner 300 is an antenna. A television broadcast (hereinafter referred to as a TV broadcast) is received via 310, and the TV broadcast is displayed on the display device 200. Here, FIG. 1 shows an integrated state in which the display device 200 and the TV tuner 300 are directly connected by a cable via a connector, and FIG. 2 shows a separated state in which the display device 200 and the TV tuner 300 are not connected by a wire. When the wired connection is released, the display device 200 and the TV tuner 300 are connected wirelessly, and a video signal related to TV broadcast received by the TV tuner 300 is transmitted to the display device 200 by wireless communication.

  Here, the TV tuner 300 functions not only as a TV tuner function but also as a relay device with an external network such as a WAN. That is, the TV tuner 300 is connected to the external network via the backbone device 50 that is wired to the external network and functions as an access point (hereinafter referred to as AP). Further, by providing a WDS (Wireless Distribution System) function, the wireless terminal 60 can function as an AP and connect a wireless terminal 60 such as a personal computer to an external network. In addition, it is assumed that other wireless terminals 70 are wirelessly connected to the backbone device 50 in addition to the separate TV 100.

  FIG. 3 is a schematic diagram showing a signal flow when the separation type TV 100 is in an integrated state, and FIG. 4 is a schematic diagram showing a signal flow when in the separation state.

  The display device 200 includes a connection unit 201, a node control unit 202, a wireless communication unit 203, a network unit 204, a media client unit 205, a video processing unit 206, a video display unit 207, and a control unit 208.

  The connection unit 201 of the display device 200 has a connector (not shown) for detachably connecting to the TV tuner 300 by wire. When this connector is connected to a connector (not shown) of a connection portion 307 of the TV tuner 300 described later, the internal bus is connected by wire, and signals can be transmitted to the TV tuner 300. Specifically, television broadcast video information received by the TV tuner 300 is transmitted to the display device 200 via the connection units 307 and 201.

  The node control unit 202 controls communication means for wirelessly communicating with the TV tuner 300, and has a function of detecting whether or not the connector of the connection unit 201 is wired with the connector of the connection unit 307. When it is detected that a wired connection is made, control is performed so that a signal is transmitted from the TV tuner 300 to the display device 200 via the connectors of the connection unit 201 and the connection unit 307. When it is detected that the wired connection is not established, the network unit 204 is controlled to transmit a television broadcast video signal from the TV tuner 300 to the display device 200 by wireless communication.

  The wireless communication unit 203 performs radio communication with the TV tuner 300 by transmitting radio waves. Note that control for wireless communication is performed by the network unit 204. When information is acquired from the TV tuner 300 by wireless communication, the information is sent to the media client unit 205 via the node control unit 202.

  The network unit 204 controls the wireless communication unit 203. Here, when the display device 200 and the TV tuner 300 release the wired connection, the node control unit 202 controls the wireless communication unit 203 to start wireless communication with the wireless communication unit 306 of the TV tuner 300 described later. To do.

  The media client unit 205 is for storing video information and the like acquired from the media server unit 304 (to be described later) when the display device 200 and the TV tuner 300 communicate wirelessly.

  The video processing unit 206 extracts television broadcast video information acquired via the node control unit 202 and video information stored in the media client unit 205 and sends the video information to the video display unit 207.

  The video display unit 207 displays video information such as a television broadcast transmitted from the video processing unit 206 on a display.

  The control unit 208 exchanges signals with the units 201 to 207 to control the display device 200.

  The TV tuner 300 includes a TV tuner unit 301, a node control unit 302, a video processing unit 303, a media server unit 304, a network unit 305, a wireless communication unit 306, a connection unit 307, and a control unit 308.

  The TV tuner unit 301 selects a broadcast wave of TV broadcast received by the antenna 310 as a desired received wave. The selected received wave is sent to the connection unit 307 or sent to the video processing unit 303 under the control of the node control unit 302 described later.

  The node control unit 302 controls communication means for communicating with the display device 200 and has a function of detecting whether or not the connector of the connection unit 307 is connected to the connector of the connection unit 201 by wire. When it is detected that a wired connection is established, control is performed so that a signal is transmitted from the TV tuner 300 to the display device 200 via a connector between the connection unit 307 and the connection unit 201. In this case, video information of the TV broadcast is transmitted from the TV tuner unit 301 to the display device 200 via the connection unit 307. On the other hand, when it is detected that the wired connection is not established, the video processing unit 303, the media server unit 304, and the network unit 305 are controlled to transmit signals from the TV tuner 300 to the display device 200 by wireless communication.

  The video processing unit 303 converts the received wave transmitted from the TV tuner unit 301 into video information when the TV tuner 300 and the display device 200 are not connected by wire. Also, the converted video information is sent to the media server unit 304.

  The media server unit 304 is for transmitting a TV broadcast program through a network, and has a streaming function of video information transmitted from the video processing unit 303.

  The network unit 305 controls the wireless communication unit 306, and has a function of determining whether or not the channel used for wireless communication with the backbone device 50 is also used for wireless communication with the display device 200. Have. When a broadcast program is wirelessly transmitted to the display device 200 while maintaining the same channel as that used for wireless communication with the backbone device 50, wireless transmission between the TV tuner 300 and the display device 200 is performed by the backbone device 50 and the terminal device 70. In some cases, the communication band for maintaining the real-time property of the video signal cannot be secured. For this reason, the network unit 305 determines whether or not the real-time property of the video signal can be maintained with the channel used for the wireless communication with the backbone device 50 being maintained. In addition, when a signal that does not require real-time property or a signal that can be transmitted at a relatively low transmission rate such as a control signal is transmitted / received, it is not always necessary to switch the communication channel. Depending on the case, it may be determined whether or not to switch channels. Alternatively, it may be determined whether or not the user is set not to switch channels. When the network unit 305 determines that the channel used for wireless communication with the backbone device 50 is not used for wireless communication with the display device 200, the network unit 305 performs control to change the channel of the wireless communication unit 306.

  The wireless communication unit 306 transmits radio waves and performs wireless communication with the display display 200. Here, wireless communication is performed using the display device 200 as a station (hereinafter referred to as STA) and the TV tuner 300 as an access point (hereinafter referred to as AP).

  Further, it has a WDS (Wireless Distribution System) function and can be wirelessly connected to the backbone device 50 and the wireless terminal 60 which are APs of the external network.

  Note that the TV tuner 300 can send a roaming request for causing the wireless terminal 60 to roam when it changes from a state where it is wirelessly connected to the wireless terminal 60 to a state where it is wirelessly connected to the display device 200. Here, “roaming” refers to a process in which the STA switches the connection destination AP. For example, the roaming process may be based on IEEE802.11r, which is currently under standard development, or may be a roaming request from the AP to the STA by uniquely extending a management frame.

  As a premise of the roaming process, a wireless connection between the TV tuner 300 and the wireless terminal 60 is established by a procedure based on the IEEE 802.11 standard as shown in FIG. The left side of FIG. 5 shows AP, and the right side shows STA.

  For details, follow the procedure below. First, a beacon including function information supported by the AP is periodically transmitted by the AP. Alternatively, the AP sends a probe response (Probe Response) to the probe request from the STA (step S1).

  When these beacons (Beacon) or probe responses (Probe Response) are received, the STA starts connection processing. Specifically, in the STA, authentication processing (Authentication) for authenticating the AP is performed (step S2). At this time, the STA sends an association request (Association Request), which is a request for establishing wireless communication (step S3). Here, the association request (Association Request) includes function information supported by the STA. Therefore, for example, the AP can be notified that the extended roaming function is supported.

  Upon receiving the association request, the AP sends out an association response (association response) including functional information for use in wireless communication with the STA and functional information supported by the AP itself ( Step S4).

  Thereby, in STA, it is determined whether a wireless connection can be established. If it is determined that the wireless connection can be established, the wireless connection is established between the AP and the STA (step S5).

  That is, the TV tuner 300 can know whether or not the wireless terminal 60, which is a STA, has a roaming function by the association request (S3). If the wireless terminal 60 has a roaming function, information on the backbone device 50 that is an AP to which the wireless terminal 60 reconnects can be given by making a roaming request to the wireless terminal 60. Thereby, the wireless terminal 60 can smoothly switch the connection destination AP to the backbone device 50.

  The connection unit 307 is a connector for making a wired connection with the display device 200. When this connector is wired to the connection unit 201 of the display device 200, the internal bus is wired and a signal can be transmitted to the display device 200. Specifically, television broadcast video information is transmitted.

  The control unit 308 exchanges signals with the units 301 to 307 to control the TV tuner 300.

  Note that, in the display device 200 and the TV tuner 300 according to the present embodiment, the wireless communication unit 203 and the wireless communication unit 306 are each compliant with the IEEE 802.11 standard and include the wireless module 500 having the configuration shown in FIG. Is.

  The wireless module 500 includes a wireless transmission / reception antenna 501, a transmission / reception unit 502, a modem unit 503, a reception intensity measurement unit 504, a transmission / reception control unit 505, a retransmission processing control unit 506, a MAC processing unit 507, a node control unit 508, an internal bus 509, an internal A memory 510 and an external interface 511 are provided.

  The wireless transmission / reception antenna 501 is an antenna for transmitting / receiving radio waves for wireless communication. That is, the received radio wave is converted into an electrical signal and sent to the transmission / reception unit 502. In addition, the electric signal transmitted from the transmission / reception unit 502 is converted into a radio wave and transmitted.

  The transmission / reception unit 502 sets a channel for wireless communication using the wireless transmission / reception antenna 501. It also has a function of converting between the RF frequency and the IF frequency.

  The modulation / demodulation unit 503 modulates / demodulates radio waves in the transmission / reception unit 502.

  The reception intensity measurement unit 504 measures intensity data of radio waves transmitted to the transmission / reception unit 502.

  The transmission / reception control unit 505 includes a frame buffer, and controls the modulation / demodulation unit 503 in conjunction with the retransmission processing control unit 506 and the MAC processing unit 507.

  The retransmission processing control unit 506 performs control for retransmitting the transmission frame as necessary.

  The MAC processing unit 507 has frame identification and error detection / correction functions.

  The node control unit 508 controls the functional blocks 501 to 507. Note that the node control unit 508 and the functional blocks 501 to 507 can transmit signals to each other using the internal bus 509 and the internal memory 510.

  The wireless module 500 can perform data transfer with the host device 600 via the external interface 511. Note that network units 204 and 305 correspond to host devices for the wireless communication units 203 and 306, respectively.

  Since the display device 200 and the TV tuner 300 are provided with the wireless module 500 having such a configuration, they can communicate with each other wirelessly.

  Next, the operation of the separation type TV 100 according to the present embodiment will be described.

(Change from integrated state to separated state)
FIG. 7 is a flowchart for explaining the operation of the TV tuner 300 when the display device 200 is separated.

  First, it is assumed that the display device 200 and the TV tuner 300 are integrated as shown in FIG. In this state, it is assumed that the wireless terminal 60 is connected to the external network via the separation TV 100 and the backbone device 50, and the wireless terminal 70 is connected to the external network via the backbone device 50.

  In such an integrated state, when the display device 200 is separated from the TV tuner 300 as shown in FIG. 2 and the connection units 307 and 201 detect the separation, the network unit 305 of the TV tuner 300 displays the TV tuner 300. Is started to change the communication destination of the wireless communication unit 306 from the backbone device 50 to the display device 200 (step T1).

  First, in the wireless communication with the display device 200, the network unit 305 determines whether the TV tuner 300 uses a channel different from the channel used in the wireless communication with the backbone device 50 (step T2). . Specifically, when another wireless terminal 70 is wirelessly connected to the backbone device 50, the TV tuner 300 and the display device 200 are wirelessly connected, which is necessary for real-time transmission of large-capacity image (moving image) data. Communication bandwidth may not be secured. Therefore, it is determined by the control of the network unit 305 whether or not it is necessary to change the channel for wireless communication. When it is determined that a bandwidth necessary for real-time transmission of moving image data can be secured, or when the backbone device 50 is not wirelessly connected to another wireless terminal 70, the process of changing the channel is not performed. That is, wireless connection with the display device 200 is performed using a channel set in advance for wireless connection with the backbone device 50 (step T2-No, step T9).

  At this time, if the data transmitted between the TV tuner 300 and the display device 200 is not moving image data, or if the user has not set the channel to be switched, the network unit 305 does not change the channel. It may be determined that there is no need to switch between.

  On the other hand, when it is determined that the channel needs to be changed, a process for changing the channel of the wireless communication unit 306 is started (step T2-Yes).

  In the process for changing the channel, it is detected whether or not the wireless terminal 60 is wirelessly connected to the TV tuner 300 itself as a STA (step T3).

  If the wireless terminal 60 is wirelessly connected, the network unit 306 further determines whether or not to perform roaming processing, that is, whether or not the wireless terminal 60 has a roaming function (step T3-Yes). , Step T4). As described above, information on whether or not the wireless terminal 60 has the roaming function can be obtained at the time of the association request in the connection process between the wireless terminal 60 and the TV tuner 300 shown in FIG.

  If the wireless terminal 60 has a roaming function, the network unit 306 transmits a roaming request to the wireless terminal 60 and controls the wireless communication unit 305 to disconnect the wireless connection. (Step T4-Yes, Step T5).

  If the wireless terminal 60 itself does not have a roaming function, the wireless terminal 60 is disconnected without transmitting a roaming request (step T4-No, step T6). Since the wireless terminal 60 cannot obtain the information of the AP to be reconnected (the basic apparatus 50 in this embodiment) from the TV tuner 300, the wireless terminal 60 searches for the basic apparatus 50 that is the AP to which the wireless terminal 60 is connected, and Perform wireless connection processing.

  Subsequently, the wireless connection with the backbone device 50 is disconnected (step T7).

  After disconnecting the wireless connection with the backbone device 50 and the wireless terminal 60, the TV tuner 300 changes the channel in order to communicate with the display device 200 (step T8). As a result, the TV tuner 300 and the display device 200 are wirelessly connected (step T9). Then, the wireless transmission of the TV broadcast program can be started (step T10).

  FIG. 8 is a sequence diagram for explaining the operation of the entire system when the display device 200 and the TV tuner 300 are separated.

  In the integrated state before the display device 200 and the TV tuner 300 are separated, it is assumed that the backbone device 50, the TV tuner 300, the TV tuner 300, and the wireless terminal 60 are wirelessly connected (step U1 and step U2). ).

  With the change from the integrated state to the separated state, the TV tuner 300 sends a roaming request to the wireless terminal 60 so as to roam to the backbone device 50 (step U3 and step U4).

  Upon receiving the roaming request, the wireless terminal 60 makes a connection request to the backbone device 50 (step U5). Thereby, a wireless connection is established between the wireless terminal 60 and the backbone device 50 (step U6).

  The TV tuner 300 sends a wireless connection disconnection notification to the backbone device 50 and starts a channel change process (steps U7 and U8).

  A wireless connection is established between the display device 200 and the TV tuner 300 using the channel after the change process (step U9).

(Change from separation to integration)
FIG. 9 is a flowchart for explaining the operation of the TV tuner 300 when integrated with the display device 200.

  First, it is assumed that the display device 200 and the TV tuner 300 are separated as shown in FIG.

  In such a separated state, when the display device 200 and the TV tuner 300 are integrated as shown in FIG. 1 and the connection parts 201 and 307 detect the connection, the connector of the connection part 201 and the connector of the connection part 307 Are controlled by the node control units 202 and 302 so as to communicate with each other (step V1). Thereby, the wireless communication from the TV tuner 300 to the display device 200 is completed, and the wireless connection is disconnected (step V2 and step V3).

  Next, whether or not the channel used for the wireless communication from the TV tuner 300 to the display device 200 is the original channel of the wireless communication between the TV tuner 300 and the backbone apparatus 50, that is, the communication destination of the TV tuner 300 Is determined by the network unit 305 whether or not the wireless communication channel needs to be changed (returned to the original state) in accordance with the switching from the display device 200 to the core device 50 (step V4).

  When it is necessary to change the wireless communication channel, the network unit 305 changes the channel of the wireless communication unit 306 (step V4-Yes / step V5). Thereby, the wireless connection between the TV tuner 300 and the backbone device 50 can be established (step V6).

  On the other hand, when it is not necessary to change the wireless communication channel, the process is terminated without changing the channel (step V4-No / step V6).

  Thereafter, the separated TV 100 is in an integrated state and performs normal operation. That is, TV broadcast video information is transmitted from the TV tuner 300 to the display device 200 via the internal bus.

  FIG. 10 is a sequence diagram for explaining the operation of the entire system when the display device 200 and the TV tuner 300 are integrated.

  In the separated state before the display device 200 and the TV tuner 300 are integrated, the backbone device 50, the wireless terminal 60, and the display device 200 and the TV tuner 300 are wirelessly connected (step W1 and step W2).

  With such a change from the separated state to the integrated state, the wireless connection between the display device 200 and the TV tuner 300 is disconnected (step W3).

  When integrated, the TV tuner 300 sets a channel for connection to the backbone device 50 (step W4). Then, a connection request is transmitted to the backbone device 50 to establish a wireless connection (steps W5 and W6).

  The wireless terminal 60 connected to the backbone apparatus 50 can be connected to the TV tuner 300 functioning as a WDS by roaming processing (steps W7 to W9).

  As described above, the separation type TV 100 according to the present embodiment connects the display device 200 and the TV tuner 300 in a detachable wired manner, and performs wireless communication when the wired connection is released. Further, the wireless transmission channel between the display device 200 and the TV tuner 300 when the wired connection is canceled can be set to a channel different from the wireless communication channel between the TV tuner 300 and the backbone apparatus 50. . Thereby, radio wave interference from other wireless terminals can be reduced, and the wireless transmission band between the display device 200 and the TV tuner 300 can be set to a band that can secure a transmission rate necessary for real-time video transmission.

  When the display device 200 and the TV tuner 300 are separated, the TV broadcast is received by wireless transmission. Therefore, the user can watch a TV broadcast program by moving the display device 200 to a favorite place without being trapped by the place of the TV tuner 300.

  When the display device 200 and the TV tuner 300 are separated as described above, the TV tuner 300 checks whether or not a communication band for wireless communication with the display device 200 can be secured, and the band is not secured. First, processing for changing the channel between the display device 200 and the TV tuner 300 is performed. Therefore, high wireless transmission quality can be ensured even when using location-free.

  Further, when a sufficient communication band cannot be ensured even if the above processing is performed, it is sufficient to perform a wired connection with an internal bus, so that more stable communication is possible as necessary.

  In particular, transmission for television broadcasting and the like requires a wide communication band and requires real-time performance. For this reason, if wireless transmission between the display device 200 and the TV tuner 300 is affected, the quality of the broadcast program may be deteriorated. In this regard, with the separable TV 100 according to the present embodiment, when the band cannot be secured, the wireless communication is performed by changing the channel, so that high wireless transmission quality can be secured.

  In addition, when the wireless terminal 60 is wirelessly connected to the TV tuner 300 according to the present embodiment, a roaming request is transmitted as necessary. Therefore, when the display device 200 and the TV tuner 300 are separated, the access destination of the wireless terminal 60 can be changed without blocking access to the external network.

(Modification)
Note that a notebook personal computer (hereinafter referred to as a notebook PC) is given as a modification of the electronic apparatus according to the present embodiment. Specifically, the display portion of the notebook PC is used as a terminal device, and the other portion is used as a base device, and the display portion and the base device are detachably wired. Thereby, a display part can be installed freely and it can be used location-free. That is, it is possible to provide a notebook PC that can ensure high wireless transmission quality when using location-free and can perform more stable communication as required.

<Others>
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine a component suitably in different embodiment.

It is a schematic diagram which shows the concept of the electronic device (integrated state) which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the concept of the electronic device (separation state) which concerns on the same embodiment. It is a schematic diagram which shows the flow of a signal when the separation type TV100 which concerns on the embodiment is an integrated state. It is a schematic diagram which shows the flow of a signal when the separation type TV100 which concerns on the embodiment is a separation state. It is a figure for demonstrating establishment of the wireless communication which concerns on the same embodiment. It is a schematic diagram which shows the structure of the wireless module 50 which concerns on the same embodiment. 5 is a flowchart for explaining an operation in the TV tuner 300 when separated from the display device 200 according to the embodiment. FIG. 6 is a sequence diagram for explaining the operation of the entire system when the display device 200 and the TV tuner 300 according to the embodiment are separated. 4 is a flowchart for explaining the operation of the TV tuner 300 when integrated with the display device 200 according to the embodiment. FIG. 6 is a sequence diagram for explaining the operation of the entire system when the display device 200 and the TV tuner 300 according to the embodiment are integrated.

Explanation of symbols

50 ... backbone device, 60 ... wireless terminal, 70 ... wireless terminal,
100 ... Wireless television receiver (separable TV) that can be separated and integrated,
200: Display device 200 (terminal device), 201: Connection unit, 202 ... Node control unit,
203 ... Wireless communication unit, 204 ... Network unit, 205 ... Media client unit,
206 ... Video processing unit, 207 ... Video display unit, 208 ... Control unit,
300 ... TV tuner (base device), 301 ... TV tuner section,
302 ... Node control unit, 303 ... Video processing unit, 304 ... Media server unit,
305 ... Network unit, 306 ... Wireless communication unit, 307 ... Connection unit, 308 ... Control unit,
310 ... Antenna, 500 ... Wireless module, 501 ... Wireless transmission / reception antenna,
502 ... Transmission / reception unit, 503 ... Modulation / demodulation unit, 504 ... Reception strength measurement unit,
505 ... Transmission / reception control unit, 506 ... Retransmission processing control unit, 507 ... MAC processing unit,
508 ... Node control unit, 509 ... Internal bus, 510 ... Internal memory,
511: External interface, 600: Host device.

Claims (10)

An electronic device including a base device that is connected to a network and wirelessly communicates with a backbone device that functions as an access point, and a terminal device that is detachably wired to the base device and capable of wireless communication with the base device. And
The base device is
A communication unit that wirelessly communicates with the backbone device when wired with the terminal device, and wirelessly communicates with the terminal device when wired connection with the terminal device is not performed;
An electronic apparatus comprising: a channel changing unit that changes a wireless communication channel of the communication unit when a wired connection between the base device and the terminal device is released. The electronic device according to claim 1,
The base device is
When a wired connection between the base device and the terminal device is released, it is determined whether to use a wireless communication channel between the communication unit and the backbone device as a wireless communication channel between the communication unit and the terminal device Further comprising channel determining means for
The electronic device according to claim 1, wherein the channel changing unit changes the wireless communication channel of the communication unit when the channel determining unit determines that the wireless communication channel between the communication unit and the backbone device is not used. In the electronic device according to claim 1 or 2,
The base device is
Means for communicating with a wireless terminal through the same channel as a channel for wireless communication with the backbone device;
An electronic device further comprising: roaming means for transmitting a roaming request to the wireless terminal to cause wireless communication with the backbone device when a wired connection between the terminal device and the base device is released . The electronic device according to claim 3,
The roaming means determines whether or not the wireless terminal has a roaming function, and transmits a roaming request to the wireless terminal when the wireless terminal has a roaming function. Electronics. The electronic device according to any one of claims 1 to 4,
The base device further includes a television tuner for receiving a television broadcast. A television receiver including a base device that is connected to a network and wirelessly communicates with a backbone device that functions as an access point and receives a television broadcast,
The television receiver body of the television receiver is:
Means for detachably wired connection with the base device;
Means for wirelessly communicating with the base device when the wired connection with the base device is canceled;
Display means for displaying a television broadcast via the base device;
The base device is
Means for receiving a television broadcast to be displayed on the display means of the television receiver body;
Means for detachably wired connection with the television receiver body;
Communication means for wirelessly communicating with the backbone device when wired with the television receiver body, and wirelessly communicating with the television receiver body when wired connection with the terminal device is not performed;
Channel determination means for determining whether or not to use a wireless communication channel between the communication means and the television receiver main body when the wired connection between the television receiver main body and the base device is released;
A television receiver comprising: a channel changing unit that changes a wireless communication channel of the communication unit when the channel determining unit determines that a wireless communication channel between the communication unit and the backbone device is not used. Machine. A television tuner that communicates wirelessly with a backbone device that is connected to a network and functions as an access point,
Wired connection means for detachably connecting to a television receiver;
Means for receiving a television broadcast to be displayed on the television receiver;
Communication means that wirelessly communicates with the backbone apparatus when wired connected to the television receiver by the wired connection means, and wirelessly communicates with the television receiver when not wiredly connected to the television receiver. When,
A television tuner, comprising: a channel changing means for changing a wireless communication channel of the communication means when the wired connection to the television receiver by the wired connection means is released. The television tuner according to claim 7,
A channel determination means for determining whether to use a wireless communication channel between the communication means and the backbone device as a wireless communication channel between the communication means and the television receiver;
The television tuner characterized in that the channel changing means changes the wireless communication channel of the communication means when it is determined by the channel determination means that the wireless communication channel between the communication means and the backbone apparatus is not used. The television tuner according to claim 7 or 8,
Means for communicating with a wireless terminal through the same channel as a channel for wireless communication with the backbone device;
Roaming means for transmitting a roaming request to the wireless terminal to cause wireless communication with the backbone device when the wired connection to the television receiver by the wired connection means is released; TV tuner. The television tuner according to claim 9, wherein
The roaming means determines whether or not the wireless terminal has a roaming function, and transmits a roaming request to the wireless terminal when the wireless terminal has a roaming function. Television tuner.

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